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Cardiovascular magnetic resonance evaluation of symptomatic severe aortic stenosis: association of circumferential myocardial strain and mortality.

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journal contribution
posted on 04.04.2017, 15:08 by Tarique Al Musa, Akhlaque Uddin, Peter P. Swoboda, Timothy A. Fairbairn, Laura E. Dobson, Anvesha Singh, Pankaj Garg, Christopher D. Steadman, Bara Erhayiem, Ananth Kidambi, David P. Ripley, Adam K. McDiarmid, Philip Haaf, Daniel J. Blackman, Sven Plein, Gerald P. McCann, John P. Greenwood
BACKGROUND: It is unknown whether circumferential strain is associated with prognosis after treatment of aortic stenosis (AS). We aimed to characterise strain in severe AS, using myocardial tagging cardiovascular magnetic resonance (CMR), prior to and following Transcatheter Aortic Valve Implantation (TAVI) and Surgical Aortic Valve Replacement (SAVR), and determine whether abnormalities in strain were associated with outcome. METHODS: CMR was performed pre- and 6 m post-intervention in 98 patients (52 TAVI, 46 SAVR; 77 ± 8 years) with severe AS. TAVI patients were older (80.9 ± 6.4 vs. 73.0 ± 7.0 years, p < 0.01) with a higher STS score (2.06 ± 0.6 vs. 6.03 ± 3.4, p < 0.001). Tagged cine images were acquired at the basal, mid and apical LV levels with a complementary spatial modulation of magnetization (CSPAMM) pulse sequence. Circumferential strain, strain rate and rotation were calculated using inTag© software. RESULTS: No significant change in basal or mid LV circumferential strain, or of diastolic strain rate, was seen following either intervention. However, a significant and comparable decline in LV torsion and twist was observed (SAVR: torsion 14.08 ± 8.40 vs. 7.81 ± 4.51, p < 0.001, twist 16.17 ± 7.01 vs.12.45 ± 4.78, p < 0.01; TAVI: torsion 14.43 ± 4.66 vs. 11.20 ± 4.62, p < 0.001, twist 16.08 ± 5.36 vs. 12.36 ± 5.21, p < 0.001) which likely reflects an improvement towards normal physiology following relief of AS. Over a maximum 6.0y follow up, there were 23 (16%) deaths following valve intervention. On multivariable Cox analysis, baseline mid LV circumferential strain was significantly associated with all-cause mortality (hazard ratio, 1.03; 1.01-1.05; p = 0.009) independent of age, LV ejection fraction and STS mortality risk score. ROC analysis indicated a mid LV circumferential strain > -18.7% was associated with significantly reduced survival. CONCLUSION: TAVI and SAVR procedures are associated with comparable declines in rotational LV mechanics at 6 m, with largely unchanged strain and strain rates. Pre-operative peak mid LV circumferential strain is associated with post-operative mortality.

Funding

This study was part-funded by the British Heart Foundation (PG/11/126/29321) and also the National Institute for Health Research (NIHR) Leeds Clinical Research Facility. GPM is supported by a NIHR career development fellowship.

History

Citation

Journal of Cardiovascular Magnetic Resonance, 2017, 19:13

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Medicine/Department of Cardiovascular Sciences

Version

VoR (Version of Record)

Published in

Journal of Cardiovascular Magnetic Resonance

Publisher

BioMed Central for Society for Cardiovascular Magnetic Resonance

issn

1097-6647

eissn

1532-429X

Acceptance date

18/01/2017

Copyright date

2017

Available date

04/04/2017

Publisher version

http://jcmr-online.biomedcentral.com/articles/10.1186/s12968-017-0329-7

Notes

Additional files Additional file 1: Figure S1. Example of inTag© analysis using CSPAMM. (DOCX 81 kb) Additional file 2: Table S1. Procedural and operative data for TAVI and SAVR procedures. (DOCX 30 kb)

Language

en